Artwork unavailableEnglish Oracle text
As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost 
less to cast.
El sonido musical de su girar abre los pestillos de la mente.En cuanto la Llave de nubes entre al campo de batalla, elige entre artefacto, criatura, encantamiento, instantáneo o conjuro.
Te cuesta menos lanzar hechizos del tipo elegido.
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Cloud Key's ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
The cost reduction applies only to generic mana in the cost of spells of the chosen type you cast.
Legality follows the dated Scryfall catalog snapshot.
For draft and prerelease, check the event’s release and rules. Missing statuses stay unavailable.
Official Magic rules| Format | Status |
|---|---|
| Standard | Not legal |
| Pioneer | Not legal |
| Modern | Legal |
| Legacy | Legal |
| Vintage | Legal |
| Commander | Legal |
| Oathbreaker | Legal |
| Alchemy | Not legal |
| Historic | Legal |
| Brawl | Legal |
| Comp. Brawl | Legal |
| Timeless | Legal |
| Pauper | Not legal |
| Duel | Legal |
For draft and prerelease, check the event’s release and rules.
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